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Wetlands have many functions that are beneficial. This module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion.4  wetlands provide food and habitat.5  wetlands save people money.his module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion. 4  wetlands provide food and habitat.
Wetlands are areas of land that are covered with water for at least part of a year. The two types of freshwater wetlands are marshes, which contain non-woody plants or shrubs, and swamps which contain woody plants or shrubs.There are also saltwater wetlands which are called estuaries.etlands generally include swamps, marshes, bogs, and similar areas.. The wetland ecosystems are one of the most important ecosystems on earth. Wetlands provide habitat that is critical for nesting, rearing, feeding, and migrating bird and other wildlife populations in watersheds across the nation.